Return-Path: Received: (qmail 33457 invoked from network); 12 Jan 2005 22:25:30 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 12 Jan 2005 22:25:30 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1Coqvh-000EWe-4T for dave@picks.force9.co.uk; Wed, 12 Jan 2005 22:25:32 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CoqvR-000EON-0D for dave@picks.force9.co.uk; Wed, 12 Jan 2005 22:25:14 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1CoqvI-000CLB-JH for dave@picks.force9.co.uk; Wed, 12 Jan 2005 22:25:04 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CoqtL-0000e0-Sm for rs_out_1@blacksheep.org; Wed, 12 Jan 2005 22:23:03 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CoqtL-0000dr-G0 for rsgb_lf_group@blacksheep.org; Wed, 12 Jan 2005 22:23:03 +0000 Received: from cmsout01.mbox.net ([165.212.64.31]) by relay.thorcom.net with esmtp (Exim 4.43) id 1CoqtI-00080X-RR for rsgb_lf_group@blacksheep.org; Wed, 12 Jan 2005 22:23:03 +0000 Received: from cmsout01.mbox.net (cmsout01.mbox.net [165.212.64.31]) by cmsout01.mbox.net (Postfix) with ESMTP id 9BA567812D for ; Wed, 12 Jan 2005 22:22:43 +0000 (GMT) Received: from uadvg130.cms.usa.net [165.212.11.130] by cmsout01.mbox.net via smtad (C8.MAIN.3.21U); Wed, 12 Jan 2005 22:22:43 GMT X-USANET-Source: 165.212.11.130 IN dibene@usa.net uadvg130.cms.usa.net X-USANET-MsgId: XID492JaLwwr7267X01 Received: from [192.168.0.2] [151.41.155.237] by uadvg130.cms.usa.net (ASMTP/dibene@usa.net) via mtad (C8.MAIN.3.21E) with ESMTP id 545JaLwwp0460M30; Wed, 12 Jan 2005 22:22:41 GMT X-USANET-Auth: 151.41.155.237 AUTH dibene@usa.net [192.168.0.2] Message-ID: <41E5A312.5040500@usa.net> Date: Wed, 12 Jan 2005 23:22:10 +0100 From: Alberto di Bene User-Agent: Mozilla Thunderbird 1.0 (Windows/20041206) X-Accept-Language: en-us, en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <41E58B5D.6070700@freenet.de> In-Reply-To: <41E58B5D.6070700@freenet.de> X-Enigmail-Version: 0.89.5.0 X-Enigmail-Supports: pgp-inline, pgp-mime Z-USANET-MsgId: XID545JaLwwQ0460X30 X-SPF-Result: relay.thorcom.net: 165.212.64.31 is neither permitted nor denied by domain of usa.net X-Spam-Score: 1.7 (+) X-Spam-Report: autolearn=no,HTML_20_30=0.504,HTML_MESSAGE=0.001,HTML_TITLE_EMPTY=0.045,MIME_HTML_ONLY=1.158 Subject: Re: LF: Simple image-cancelling exciter for digimodes Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_20_30,HTML_MESSAGE, HTML_TITLE_EMPTY,MIME_HTML_ONLY autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Hello Wolf,

congratulations for this project, I am sure it can open new possibilities to would-be experimenters in LF.
As you mentioned, Jason V0.99 (to be released soon on the Web site) has I/Q outputs, as does your
Spectrum Lab, so a couple of software tools are just waiting for some soldering irons to be swiitched on,
and handled by the correct end...

I am wondering if a reverse form of the (in)famous Tayloe sampling detector could be used here.
What I mean is to take your four I+, I-, Q+, Q- signals and to multiplex them into a single output,
using an analog multiplexer, single pole, quadruple throw, like the FST3253 or the ADG704, driven by
a clock 4x the wanted output frequency. This would simplify considerably the hardware, should it work.

My soldering iron is on a temporary vacation, so I am relying on someone else to volunteer for that...

73 Alberto I2PHD
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Wolf DL4YHF wrote:

Hello Alberto, Eberhard, John, and all,

I made some tests with an image-cancelling mixer for the 136 kHz lately, using the "SSB phasing method" as described in the ARRL handbook. The only tricky part, the 90° audio phase shifter, is realized via software.
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